Kali Linux is a Linux distribution designed for digital forensics and penetration testing. It is maintained and funded by Offensive Security. The software is based on the DebianTesting branch: most packages Kali uses are imported from the Debian repositories. The tagline of Kali Linux and BackTrack is "The quieter you become, the more you are able to hear", which is displayed on some backgrounds, see this example. Kali Linux has gained immense popularity in the cybersecurity community due to its comprehensive set of tools designed for penetration testing, vulnerability analysis, and reverse engineering.